99 lines
3.6 KiB
Go
99 lines
3.6 KiB
Go
// Mgmt
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// Copyright (C) 2013-2024+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//
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// Additional permission under GNU GPL version 3 section 7
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//
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// If you modify this program, or any covered work, by linking or combining it
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// with embedded mcl code and modules (and that the embedded mcl code and
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// modules which link with this program, contain a copy of their source code in
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// the authoritative form) containing parts covered by the terms of any other
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// license, the licensors of this program grant you additional permission to
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// convey the resulting work. Furthermore, the licensors of this program grant
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// the original author, James Shubin, additional permission to update this
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// additional permission if he deems it necessary to achieve the goals of this
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// additional permission.
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package coremath
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import (
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"context"
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"fmt"
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"github.com/purpleidea/mgmt/lang/funcs/multi"
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"github.com/purpleidea/mgmt/lang/interfaces"
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"github.com/purpleidea/mgmt/lang/types"
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)
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func init() {
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typInt := types.NewType("func() int")
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typFloat := types.NewType("func() float")
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multi.ModuleRegister(ModuleName, "fortytwo", &multi.Scaffold{
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T: types.NewType("func() ?1"),
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M: multi.TypeMatch(map[string]interfaces.FuncSig{
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"func() int": fortyTwo(typInt),
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"func() float": fortyTwo(typFloat),
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}),
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//M: func(typ *types.Type) (interfaces.FuncSig, error) {
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// if typ == nil {
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// return nil, fmt.Errorf("nil type")
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// }
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// if typ.Kind != types.KindFunc {
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// return nil, fmt.Errorf("not a func")
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// }
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// if len(typ.Map) != 0 || len(typ.Ord) != 0 {
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// return nil, fmt.Errorf("arg count wrong")
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// }
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// if err := typ.Out.Cmp(types.TypeInt); err == nil {
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// return fortyTwo(typInt), nil
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// }
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// if err := typ.Out.Cmp(types.TypeFloat); err == nil {
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// return fortyTwo(typFloat), nil
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// }
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// return nil, fmt.Errorf("can't use return type of: %s", typ.Out)
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//},
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})
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}
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// fortyTwo is a helper function to build the correct function for the desired
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// signature, because the multi func API doesn't tell the implementing function
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// what its signature should be! In the next version of this API, we could pass
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// in a sig field, like how we demonstrate in the implementation of FortyTwo. If
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// the API doesn't change, then this is an example of how to build this as a
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// wrapper.
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func fortyTwo(sig *types.Type) interfaces.FuncSig {
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return func(ctx context.Context, input []types.Value) (types.Value, error) {
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return FortyTwo(sig, input)
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}
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}
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// FortyTwo returns 42 as either an int or a float. This is not especially
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// useful, but was built for a fun test case of a simple poly function with two
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// different return types, but no input args.
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func FortyTwo(sig *types.Type, input []types.Value) (types.Value, error) {
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if sig.Out.Kind == types.KindInt {
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return &types.IntValue{
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V: 42,
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}, nil
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}
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if sig.Out.Kind == types.KindFloat {
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return &types.FloatValue{
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V: 42.0,
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}, nil
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}
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return nil, fmt.Errorf("unknown output type: %+v", sig.Out)
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}
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